With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
tn3270eTcpConnBytesIn
tn3270e Tcp Connection Bytes In
1.3.6.1.2.1.34.8.1.9.1.8
The number of bytes received by the server from TCP for this connection.
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IPHost Network monitor allows you to monitor tn3270eTcpConnBytesIn on IBM device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring IBM Flex systems right now.